Barometric regulator



Patented Oct. 5, 1943 nanolvmrmc nmumfraa Morr s W. Grew. $he ra eish s.Qlaia. a sign?! to The Hotstream Heater Company cre asse time; ct'ririititii of Ohio Applicatiqg m. s, 1941, Serial No. 389,304 E aine. 59

his. invention relates. o improremen s n b r ri re u a ors r dam ers.which a e 34. armed sa an tt r e e ie tq draftte din vtqopen them.

A 1 b ect of the pr se t n n ion is topr ide 1 a amper eonstruet n nv aount rw i ht s mev hle e ess he acet'th da per t v var e Re eased 2 9i.he eof. o eth r w th mete ea s. r ma in th counterweig t. this metermeans bein s ne a ed directlyuppn the. am er Aeethee ebie i. Q the E f-.5. ntention s to nmv e he were; er vot l; me e aheut. a of? en e axi hrehr a e aiewe -ht e dam er.- s an we si e he-ax t an. on t he ne h rwith JQQQQQQ T' t 99. we t e c u er eigh which s n ented n. e light r sde at the ames 9. at least Beri t esa rbe ae e the i :13 damper. i

Other objects and advantages of the invention reside in the constructionand arrangement of the parts so as to carry out the desired functionsand the essential features thereof will be set forth in the claims.

In the drawing, Fig. 1 is an elevational View of a damper equipped withmy improved mechanism; Fig. 2 is a sectional view of the same tokenalong the line 22 of Fig. 1; while Fig. 3 is a wiring diagram showingone manner in which the equipment may be used.

In the drawing, a flue is indicated at l0 having an open end at H andthe other end of which l2 may be connected to the breaching leading to astack or the like so that stack draft is efi'ective on the right-handface of the damper as shown in Fig. 2 and atmospheric pressure iseffective upon the left-hand face thereof. A shaft I3 extends across thedamper and is connected to the main plate 14 of the damper. The ends ofshaft I3 are mounted in suitable bearings l 5 which are carried by theflue walls. Stifiener angles 16 extend vertically along the damper plateto stiffen it and a channel I! extends horizontally across the damperfor stiffening purposes. It will be noted that the pivot shaft I3 islocated ofi-center with respect to the damper and in fact is aboutone-third of the depth of the flue from the top or two-thirds up fromthe bottom. It results from this contsruction that without the use ofcounterweights the weight of the damper below the shaft l3 would tendalways to retum' the damper to the closed position shown in Fig. 2. Theeffect of draft in the breeching connected at the point 12 is to causethe damper to swing in a ooiants l lo s ise d rection. bout t e sha t.[3. v ewe n E a, 991 an incr a in, he d af r Mea s s. Provided d a x b ne ott ie i a tme about. he he t; 3. o. to c use the damp z' o. open withigher or, ow r af as. d sited- T e means er sh w om r s a teem we ehtnher ts thr aded e a m nt wi h a tich s ou d paral o nd ad: J'aeent hsamee 'p ate t The i untine cme pr es a. rack t. hold n t ear or theower.- e l or screw t a a ra ke 1'. which held a ear ng or he upper nd ohe scr w th eoum rvzeieht is rov d with one it more rollers 22 which eurpn the. i ht-hammers 9i dam e late M; v ew-ed in i 2 and Pr Ye t ieatiq oi e eunterw sh el vethe scr w. this r tation f the cause Emmett t;h c i e erweieht r sswi e e he P. a WAIT-X: the "PQ s'QIQ A- 0t W mer:weight IS with respect to the; =piyotal l3. This changes the balance ofthe damper about the shaft [3.

Power means is provided for moving the counterweight. The-means hereshown comprises a motor 23 mounted on the damper plate l4 and drivingthrough reduction gearing 24 an output shaft 25 which is pinned orotherwise connected to the screw l9. An upper bearing 26 maybe providedfor the output shaft 25 if desired or the bearings in the motor andreduction unit may be relied upon to support the upper end of screw I9.Obviously rotation of motor 23 in one direction will cause travel ofcounterweight l8 downwardly along the screw l9 and reverse movement ofmotor 23 will cause upward movement of counterweight I8.

Limit switches 21 and 28 are provided for stopping movement of the motorif the counterweight l8 reaches the end of its travel in eitherdirection. These switches may be of the type disclosed in Patent No.1,960,020, granted May 22, 1934, to P. K. McGall. For instance ifcounterweight l8 moves upward slightly from the position shown in Fig. 2it will strike the blade 21a of switch 21 and open the motor drivingcircuit which causes weight I8 to move upwardly. When weight I8 reachesthe lower limit of its travel it will strike collar 29 which is pinnedto shaft 30 and. normally urged upwardly by spring 3|. Pinned to theupper end of rod 30 is another collar 32 which when pulled downwardlywill engage blade 28a of switch 28 and open that circuit of motor 23which drives weight l8 downwardly. The wiring connections to motor 23Referring to the diagram of Fig. 3, line 34 leads from one side of theelectric supply line through a manual control or from that side of anautomatic controller tending to increase the draft, whereas line 35leads from another side of the line connected with a source ofelectricity through a manual control or an automatic controller whichtends to decreasethe amount of draft. either case.

It is believed that the operation of my -im-- proved regulator will nowbe readily understood. Assuming the limit switches 21 and 28 are closed,if the side of the line indicated at 34 is closed by means of a manualbutton or an automatic controller, motor 23' will be energized and willrotate screw I9 so as to carry counterweight l8 downwardly. Thisincreases the tendency of the damper to remain closed and greater draftwill be necessary in the breechingconnected at l2 before the damper canbe opened. If on the other hand a manual button or an automaticcontroller closes the circuit through'lines 35 and 36, motor 23 will beoperated in the opposite direction and will cause weight l8 to rise so'that the damper opens more easily and there 'will be less draft in thebreeching.

It will be noted that a metallic cover 31 has been provided over motor23 and switches'Tl and 28 to protect them. Also a cover 38 on theopposite side of the damper serves to protect the screw l9 and all partsassociated with'it there.

What I claim is:

Line 36 is the common return line in I p r 1. In combination, a draftdamper having a pivotal mounting in a flue, said mounting providing apivotal axis off center relative to the damper so that there is less ofthe weight of the damper on one side of said axis than on the otherside, a screw close to said damper and parallel to its face, acounterweight threaded on said screw for movement therealong by rotationof said screw, a motor having a driving connection with said screw forrotating the latter, said motor being mounted on said damper close tothe face thereof and on that side of said axis where less weight of saiddamper is disposed, said motor being located near one end of said screw,two limit switches mounted near said motor, one of said switches beingoperable by said counterweight at said one end of said screw,

and an operator for the other of said switches extending to the otherend of said screw and there engageable by said counterweight.

2. In combination in a furnace flue having a stack connection and a coldair connection, a draft damper having a pivotal mounting in said fluebetween said connections, said mounting providing a pivotal axis oficenter relative to the damper so that there is less of the weight of thedamper on one side of said axis than on the other side, a counterweightmounted for movement across said damper at an angle to said axis, and amotor having a driving connection with said counterweight for moving it,said motor being mounted on said damper within the area of said damperand on that side of said axis where less weight of the damper isdisposed, whereby said motor counterbalances at least part of theheavier side of the damper, and said motor being mounted on said damperon the side thereof toward said cold air connection so that said motoris cooled by the flow of air into said fiue.

' MORRIS W. CREW.

